6 zone wirefree alarm kit contains: 1 x siren & LED strobe, 1 x 6 zone control unit with internal siren, 1 x power supply adaptor, 2 x 6 volt back up batteries for control unit, 1 x wireless passive infra red detector, 2 x wireless magnetic contact dete Totally wirefree, simple & quick to install Tamper protection & jamming detection facilities incorporated Armed / disarmed via a remote control unit Simple to expand with full range of accessories Non volatile memory (NVM) will not lose programming on mains failure Battery low indicators on PIR & magnetic contact detectors & remote control